For the books you want to read in another language

Bring your book. Tobien brings the mentor.

Stay with the story, even when the language is new. Tap a word to understand it, explore the grammar with AI, and remember what you learn through practice built from your reading.

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Your own booksContextual AIPersonalised practice

The Metamorphosis

Franz Kafka · Chapter I

Excerpt 1 / 3

fand er sich in seinem zu einem ungeheueren .

verwandelt

verwandelnto transform

Past participle · Partizip II

/fɛɐ̯ˈvandl̩t/

Verb · resulting state

In this sentence

He finds himself already transformed. The participle describes the state he discovers, rather than an action he chooses.

Natural translation

… he found himself transformed in his bed into a monstrous creature.

Literal translation

… found he himself in his bed into a monstrous vermin transformed.

Words in context

Bettbed
Ungeziefervermin
verwandeltto transform

How the sentence works

sich + Zustand + finden

Fand is the past tense of finden. Sich refers back to er. Verwandelt describes the state in which he finds himself; zu introduces what he has become.

A closer look

Ungeziefer is deliberately unspecific. It conveys disgust without identifying a particular insect. “Vermin” keeps that uncertainty; “creature” sounds more natural in this short translation.

Try it: tap a word, ask the mentor, then practise. Sample content.

From the founder

I needed a book, not another course.

When I moved to Spain I did not speak Spanish. I wanted to learn in a way that felt interesting and practical. People kept saying the same thing: read books. I needed more than a convenient translation. I needed to understand why a sentence chose this construction and not another. I looked for an app that could do both. I did not find one.

So I made Tobien. You bring a book you actually want to read. An AI mentor stays on the page with you: the translation, the grammar, and the small peculiarities of the language. I still learn Spanish this way. It works. The results are already here.

Todo bien.VadimFounder of Tobien, and still its first reader

Vadim, founder of Tobien

From the first page to a word that stays

One book. A whole way to learn.

Read at your own pace. Slow down for a sentence, open its explanation, or return to the words you want to remember. Everything starts with the text.

One sentence. Room to understand it.

Switch to Focus to work through a passage one sentence at a time. The surrounding lines stay in sight, and a swipe takes you to the next sentence.

Explore the demo. Tap the words and controls to see how it works.

The Metamorphosis

Franz Kafka · Chapter I

Excerpt 1 / 3

fand er sich in seinem zu einem ungeheueren .

verwandelt

verwandelnto transform

Past participle · Partizip II

/fɛɐ̯ˈvandl̩t/

Verb · resulting state

In this sentence

He finds himself already transformed. The participle describes the state he discovers, rather than an action he chooses.

Natural translation

… he found himself transformed in his bed into a monstrous creature.

Literal translation

… found he himself in his bed into a monstrous vermin transformed.

Words in context

Bettbed
Ungeziefervermin
verwandeltto transform

How the sentence works

sich + Zustand + finden

Fand is the past tense of finden. Sich refers back to er. Verwandelt describes the state in which he finds himself; zu introduces what he has become.

A closer look

Ungeziefer is deliberately unspecific. It conveys disgust without identifying a particular insect. “Vermin” keeps that uncertainty; “creature” sounds more natural in this short translation.

A small tap. A deeper understanding.

There is more to a word than its translation.

Meaning in this sentence

See the form you tapped, its dictionary meaning and the way it is being used here. Keep the sentence in sight while you explore.

Hear it. Recognise it.

Listen to the word, check its transcription and discover its grammatical form. Connect what you see on the page with how it sounds.

A vocabulary that knows you

Mark words as known, learning or ignored. Find them again in your vocabulary, and let the highlights show what is becoming familiar.

A conversation that starts on the page

Follow your curiosity.

A translation can answer “what”. Your AI mentor helps with “why”. Ask about a construction, compare expressions, or ask for a simpler explanation.

Grammar in the passage you are reading
Follow up and return to saved conversations
Type a question or use voice input

Try a question

The sentence is your starting point.

Disculpe, no entiendo lo que me ha dicho.

How ha dicho works

Ha is a form of haber, and dicho is the irregular past participle of decir. Together they mean “you have said” here: a completed action connected to the present conversation. The polite usted form uses the same verb form as él and ella.

An interactive example with prepared answers. In the app, ask your own questions.

Your interests set the course

Start with a book you want to finish.

Bring a favourite, discover a classic, or pick something a little beyond your comfort zone. Tobien helps you find a starting point and keeps your place as you go.

EPUBPDFDOCX / DOCTXT / RTFFB2HTML / Markdown

Your imported books stay in your personal library.

Bring your own books

Import a file and start exploring its words and sentences. PDFs keep page navigation, so you can work through them page by page.

Find your next read

Browse books from Project Gutenberg, Wikisource and OAPEN. Explore by language and level, then add a title to your library.

Know how a book fits you

94%familiar words

Example vocabulary coverage. See how much of a book is already familiar before choosing your next challenge.

The learning continues after the page

Make each chapter stay with you.

Practice that adapts

Choose a meaning, find a word form, type an answer or assemble a sentence. Exercises grow from your reading and adjust to your progress.

4 exercise formats

A reason to come back

Review words over time, with explanations that help them make sense. Download a practice pack and use it even when you are offline.

Offline review

Progress you can see

Follow your reading time, daily goal and growing vocabulary. Open your library to pick up the book right where you left it.

Your pace, your goals

Settle in for another chapter

Make room for the way you read.

Choose paper, sepia, night or black. Adjust the reading size and line spacing in the app. Keep a whole page in view, or give one sentence your full attention.

Try the themes here. The reader and its explanations change with you.

A little more familiar, every day.

Disculpe, no entiendo lo que me ha dicho.

NewLearningKnown

Gentle highlights help you recognise the words you are still getting to know.

Choose the language of your next book

Six languages. Your own way in.

Build your vocabulary through books in the language you are learning. The app interface is available in English and Russian.

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Take Tobien with you

Your next chapter can be in another language.

Bring the book you have been meaning to read. Find the meaning, follow your questions, and make the language a little more your own.

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